C - Chemistry – Metallurgy – 08 – J
Patent
C - Chemistry, Metallurgy
08
J
319/49, 319/62
C08J 5/18 (2006.01) B01D 67/00 (2006.01) B01D 69/12 (2006.01) B32B 5/14 (2006.01) H01M 2/14 (2006.01) H01M 2/16 (2006.01)
Patent
CA 1169118
Abstract of the Disclosure The present invention is directed to microporous mem- branes having a surfactant impregnated therein which is coated on at least one surface thereof with a polymer coating, such as cellulose acetate. The polymer coating possesses functional groups in the presence of an aqueous alkaline environment which permits it to undergo hydrogen bonding with water and to transport battery electrolyte through the coating by diffusion. The presence of the coating on the normally hydrophobic substrate membrane, when used in conjunction with a suitable surfactant, increases the wettability of the substrate membrane and thereby lowers its electrical resistance. The coating also serves to immobilize various soluble electrode derived ions at the coating- electolyte interface thereby hindering their penetration into the pores of the substrate microporous membrane. Consequently, the plugging of the pores of the substrate membrane by these ions is substantially reduced thereby increasing the life of a battery in which said coated membranes are used as battery separators.
382634
Celanese Corporation
Smart & Biggar
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